Fair Value Measurements Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial assets
Cash and due from banks	$ 355,541us-gaap_CashAndDueFromBanks	$ 444,113us-gaap_CashAndDueFromBanks
Cash and due from banks, Fair Value	355,541	444,113
Interest-bearing deposits in other financial institutions	488,426us-gaap_InterestBearingDepositsInBanks	571,924us-gaap_InterestBearingDepositsInBanks
Interest-bearing deposits in other financial institutions, Fair value	488,426	571,924
Federal funds sold and securities purchased under agreements to resell	3,380	16,030
Federal funds sold and securities purchased under agreements to resell, Fair value	3,380	16,030
Investment securities held to maturity, carrying amount	438,047us-gaap_HeldToMaturitySecurities	404,455us-gaap_HeldToMaturitySecurities
Fair value	446,697	413,067
Investment securities available for sale, at fair value	5,358,310us-gaap_AvailableForSaleSecurities	5,396,812us-gaap_AvailableForSaleSecurities
Investment securities available for sale, fair value	5,358,310	5,396,812
Federal Home Loan Bank and Federal Reserve Bank stocks, carrying amount	189,222	189,107
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	189,222	189,107
Loans held for sale	159,963us-gaap_LoansReceivableHeldForSaleNet	154,935us-gaap_LoansReceivableHeldForSaleNet
Loans held for sale, fair value	161,662	156,423
Loans, net	17,713,764	17,327,544
Loans, net Fair value	17,921,155	17,427,647
Bank owned life insurance, carrying amount	576,707us-gaap_BankOwnedLifeInsurance	574,154us-gaap_BankOwnedLifeInsurance
Bank owned life insurance, Fair value	576,707	574,154
Accrued interest receivable, carrying amount	69,759us-gaap_InterestReceivable	67,573us-gaap_InterestReceivable
Accrued interest receivable, Fair value	69,759	67,573
Interest rate-related agreements, carrying amount	38,990	33,023
Interest rate-related agreements, fair value	38,990	33,023
Foreign currency exchange forwards	3,346asb_ForeignCurrencyContractAsset	2,140asb_ForeignCurrencyContractAsset
Foreign currency exchange forwards, Fair value	3,346	2,140
Interest rate lock commitments to originate residential mortgage loans held for sale	3,685asb_InterestRateLockCommitments	1,947asb_InterestRateLockCommitments
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	3,685	1,947
Purchased options (time deposit), carrying value	6,111asb_PurchasedDepositOption	6,054asb_PurchasedDepositOption
Purchased options (time deposit), fair value	6,111asb_PurchasedDepositOptionAtFairValue	6,054asb_PurchasedDepositOptionAtFairValue
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	18,215,591asb_DepositsExcludingTimeDeposits	17,192,049asb_DepositsExcludingTimeDeposits
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	18,215,591	17,192,049
Brokered CDs and other time deposits	1,636,001asb_BrokeredCdsAndOtherTimeDeposits	1,571,455asb_BrokeredCdsAndOtherTimeDeposits
Brokered CDs and other time deposits, Fair value	1,639,738	1,571,455
Short-term funding	662,537us-gaap_ShortTermBorrowings	1,068,288us-gaap_ShortTermBorrowings
Short-term funding, Fair value	662,537us-gaap_ShorttermDebtFairValue	1,068,288us-gaap_ShorttermDebtFairValue
Long-term funding	3,429,925us-gaap_LongTermDebt	3,930,117us-gaap_LongTermDebt
Long-term funding, fair value	3,487,809us-gaap_LongTermDebtFairValue	3,975,605us-gaap_LongTermDebtFairValue
Accrued interest payable	8,582	9,530
Accrued interest payable, Fair value	8,582	9,530
Interest rate-related agreements	41,633asb_InterestRateRelatedAgreements	35,372asb_InterestRateRelatedAgreements
Interest rate-related agreements, Fair value	41,633	35,372
Foreign currency exchange forwards	3,097asb_ForeignCurrencyContractsLiability	1,957asb_ForeignCurrencyContractsLiability
Foreign currency exchange forwards, Fair value	3,097	1,957
Standby letters of credit, carrying amount	3,373us-gaap_LineOfCredit	3,542us-gaap_LineOfCredit
Standby letters of credit, Fair value	3,373	3,542
Forward commitments to sell residential mortgage loans	1,795asb_ForwardCommitments	2,435asb_ForwardCommitments
Forward commitments to sell residential mortgage loans, fair value	1,795	2,435
Written options (time deposit), carrying value	6,111asb_WrittenDepositOption	6,054asb_WrittenDepositOption
Written option (time deposit), fair value	6,111asb_WrittenDepositOptionAtFairValue	6,054asb_WrittenDepositOptionAtFairValue
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks, Fair Value	355,541	444,113
Interest-bearing deposits in other financial institutions, Fair value	488,426	571,924
Federal funds sold and securities purchased under agreements to resell, Fair value	3,380	16,030
Fair value	0	0
Investment securities available for sale, fair value	4,200	3,957
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	0	0
Loans held for sale, fair value	0	0
Loans, net Fair value	0	0
Bank owned life insurance, Fair value	0	0
Accrued interest receivable, Fair value	69,759	67,573
Interest rate-related agreements, fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	0	0
Purchased options (time deposit), fair value	0	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	0	0
Brokered CDs and other time deposits, Fair value	0	0
Short-term funding, Fair value	0	0
Long-term funding, fair value	0	0
Accrued interest payable, Fair value	8,582	9,530
Interest rate-related agreements, Fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Standby letters of credit, Fair value	0	0
Forward commitments to sell residential mortgage loans, fair value	0	0
Written option (time deposit), fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and due from banks, Fair Value	0	0
Interest-bearing deposits in other financial institutions, Fair value	0	0
Federal funds sold and securities purchased under agreements to resell, Fair value	0	0
Fair value	446,697	413,067
Investment securities available for sale, fair value	5,353,910	5,392,655
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	189,222	189,107
Loans held for sale, fair value	161,662	156,423
Loans, net Fair value	0	0
Bank owned life insurance, Fair value	576,707	574,154
Accrued interest receivable, Fair value	0	0
Interest rate-related agreements, fair value	38,990	33,023
Foreign currency exchange forwards, Fair value	3,346	2,140
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	0	0
Purchased options (time deposit), fair value	6,111	6,054
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	0	0
Brokered CDs and other time deposits, Fair value	1,639,738	1,571,455
Short-term funding, Fair value	662,537	1,068,288
Long-term funding, fair value	3,487,809	3,975,605
Accrued interest payable, Fair value	0	0
Interest rate-related agreements, Fair value	41,633	35,372
Foreign currency exchange forwards, Fair value	3,097	1,957
Standby letters of credit, Fair value	3,373	3,542
Forward commitments to sell residential mortgage loans, fair value	0	0
Written option (time deposit), fair value	6,111	6,054
Fair Value, Inputs, Level 3 [Member]
Financial assets
Cash and due from banks, Fair Value	0	0
Interest-bearing deposits in other financial institutions, Fair value	0	0
Federal funds sold and securities purchased under agreements to resell, Fair value	0	0
Fair value	0	0
Investment securities available for sale, fair value	200	200
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	0	0
Loans held for sale, fair value	0	0
Loans, net Fair value	17,921,155	17,427,647
Bank owned life insurance, Fair value	0	0
Accrued interest receivable, Fair value	0	0
Interest rate-related agreements, fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	3,685	1,947
Purchased options (time deposit), fair value	0	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	18,215,591	17,192,049
Brokered CDs and other time deposits, Fair value	0	0
Short-term funding, Fair value	0	0
Long-term funding, fair value	0	0
Accrued interest payable, Fair value	0	0
Interest rate-related agreements, Fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Standby letters of credit, Fair value	0	0
Forward commitments to sell residential mortgage loans, fair value	1,795	2,435
Written option (time deposit), fair value	$ 0	$ 0

Accrued interest receivable fair value disclosure.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Bank owned life insurance fair value disclosure.

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- Definition

Brokered cds and other time deposits

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Brokered cds and other time deposits fair value

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Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits

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No definition available.

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Fair Value of noninterest-bearing demand, savings, interest-bearing demand, and money market deposits

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No definition available.

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Federal Home Loan Bank And Federal Reserve Bank Stocks Fair Value Disclosure.

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No definition available.

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- Definition

Foreign currency contracts asset

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No definition available.

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- Definition

Foreign Currency Contracts, Liability.

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No definition available.

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Namespace Prefix:	asb_
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- Definition

Forward commitments to sell residential mortgage loans

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No definition available.

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- Definition

Forward commitments to sell residential mortgage loans

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No definition available.

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- Definition

Interest bearing deposits in banks fair value disclosure.

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No definition available.

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- Definition

Commitments to extend credit where the interest rate is locked in advance of funds being disbursed for a specified period of time.

+ References

No definition available.

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- Definition

Commitments to extend credit where the interest rate is locked in advance of funds being disbursed for a specified period of time, at fair value

+ References

No definition available.

+ Details

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- Definition

Interest Rate Related Agreements.

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- Definition

Interest Rate Related Agreements Fair Value.

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No definition available.

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- Definition

Loans Receivable Net Fair Value Disclosure.

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No definition available.

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- Definition

Other derivatives not designated as hedging instruments.

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No definition available.

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- Definition

Options for equity-indexed derivatives

+ References

No definition available.

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- Definition

Options for equity-indexed derivatives, at fair value

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- Definition

Written deposit option for equity-indexed derivatives

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No definition available.

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- Definition

Written deposit option for equity-indexed derivatives, at fair value

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- Definition

Fair value portion of accrued expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-SubTopic 10

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-Paragraph 5

-Subparagraph (aa)

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-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- Definition

For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Name Accounting Standards Codification

-Glossary Cash Equivalents

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-Topic 942

-SubTopic 210

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1, 2, 3

-Article 9

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- Definition

Fair value portion of federal funds sold and securities borrowed or purchased under agreements to resell.

+ References

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Includes: (1) the amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements (Federal Funds Sold) and (2) the dollar amount outstanding of funds lent in the form of security resale agreements regardless of maturity, if the agreement requires the bank to resell the identical security purchased or a security that meets the definition of substantially the same in the case of a dollar roll. Also include purchases of participations in pools of securities, regardless of maturity (Securities Purchased Under Agreements to Re-sell).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(2)(i))

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 1(i)

-Article 4

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- Definition

Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

+ References

No definition available.

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

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- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

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-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (c)

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.6)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

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- Definition

For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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-SubTopic 210

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-Subparagraph (SX 210.9-03.2)

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-Section 45

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 9

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

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-Number 210

-Section 02

-Paragraph 8

-Article 5

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Subparagraph (SX 210.9-03.16)

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Line-of-Credit Arrangement

-URI http://asc.fasb.org/extlink&oid=6517033

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- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

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Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section 30

-Paragraph 1

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

Net fair value of all derivative instruments not designated as a hedging instrument.

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-Topic 825

-SubTopic 10

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-Paragraph 10

-Subparagraph (a)

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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-Publisher SEC

-Name Regulation S-X (SX)

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-Number 210

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-Article 7

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 2, 3

-Article 9

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